A gas is at 1 atm pressure with a volume of 800 cm 3 . When 100 J of heat is supplied to the gas, it expands to 1 L , at a constant pressure. The change in its internal energy is

Question

A gas is at 1 atm pressure with a volume of 800 cm 3 . When 100 J of heat is supplied to the gas, it expands to 1 L , at a constant pressure. The change in its internal energy is, 80 J, - 80 J, 20 J, - 20 J

MARKS App · Accepted Answer

Work done by the gas at constant pressure Δ W = P Δ V = 1 × 1 0 5 N m - 2 1 0 0 0 - 8 0 0 × 1 0 - 6 m 3 = 2 0 J Δ U = Δ Q - Δ W Δ U = 1 0 0 J - 2 0 J = 8 0 J

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